Adam Young as alternate Policy maintainer

Change-Id: I8d1e240d8bbc7be5a90e250603a9f7b3d4cb0062
Type check for Message param to avoid AttributeError

Setting the locale iteratively on Messages within a Message may cause an
AttributeError when trying to set the locale on a message substitution
that is thought to be a dict() but may be anything.

Currently even the following code would be a problem:
    msg =  _('This is a message: %s') % 'Hi'

Closes-bug: #1229364

Change-Id: I6fe55ebc4eea5fef1d335ad83a84c4879f7f06f9
Require oslo.config 1.2.0 final

Now that 1.2.0 has been released, require it rather than one of the beta
release tarballs.

Closes-Bug: #1182861
Change-Id: I75ffc4a572d14488d19491a38742d6920951c171
Merge "Require oslo.config 1.2.0 final"
Merge "Adam Young as alternate Policy maintainer"